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The friction coefficient between plank a...

The friction coefficient between plank and flooe is `mu`. The man applies, the maximum possible foce on the string and the system remains at rest. Then

A

frictional force between plank and surface is `(2mumg)/(1+mu)`

B

frcitional force on man is zero

C

tension is the string is `(2mu mg)/(1+mu)`

D

net force on man is zero

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D

For man and plank as a system
`T+N=2mg rArrN=2m-T`
`T=muN=mu(2mg-T)rArrT=(2mumg)/(1+mu)`,
Friction force `-muN=T`
No horizontal acts on man, so no friction force will act on man. Also he is in equilibrium so net force acting on man is zero.
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